kconfig_lint: update kconfig lint shell scripts

- Add lint-stable script with just error checking
- Enable warnings in addition to errors in non-stable test.
- Use git grep if the code is in a git repo now that exclusions are
working.
- Check for perl, and ask the user to install it if it isn't
available.

Change-Id: Ie60d21f4ef8a61d879f116eb2056eb805b0a55f2
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/13542
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

0 files changed, 0 insertions, 0 deletions